Cita APA (7a ed.)

Howard, P. (1984). The state of the language: English observed. Penguin books.

Cita Chicago Style (17a ed.)

Howard, Philip. The State of the Language: English Observed. New York [etc.]: Penguin books, 1984.

Cita MLA (9a ed.)

Howard, Philip. The State of the Language: English Observed. Penguin books, 1984.